CN214797681U - Dual-band Wilkinson power divider with dual-coupling line and open-circuit line structure - Google Patents
Dual-band Wilkinson power divider with dual-coupling line and open-circuit line structure Download PDFInfo
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- CN214797681U CN214797681U CN202022256035.5U CN202022256035U CN214797681U CN 214797681 U CN214797681 U CN 214797681U CN 202022256035 U CN202022256035 U CN 202022256035U CN 214797681 U CN214797681 U CN 214797681U
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Abstract
The utility model discloses a double-frequency-band Wilkinson power divider of double-coupling line and open circuit line structure, the divider includes casing, dielectric slab, input assembly, output assembly, three terminal resistance, an isolation resistance, first transmission line, second transmission line and third transmission line, the third transmission line is connected with input assembly, first transmission line and second transmission line connection third transmission line, first transmission line and second transmission line are the coupling line, the third transmission line is the open circuit line, isolation resistance connects between first coupling line and second coupling line, through inserting two sections coupling lines that have different odd-even mode characteristic impedance at input and output port to reduce circuit's size.
Description
Technical Field
The utility model relates to a power divider field, in particular to double-frequency-band Wilkinson power divider of double coupling line and open circuit line structure.
Background
The Power divider is a device for dividing one path of input signal energy into two paths or multiple paths of energy with equal or unequal outputs, or combining multiple paths of signal energy into one path of output, which can also be called a combiner, a certain isolation degree should be ensured between output ports of one Power divider, the Power divider is generally divided into one-to-two (one input and two outputs), one-to-three (one input and three outputs) and the like according to the output, the main technical parameters of the Power divider are Power loss (including insertion loss, distribution loss and reflection loss), voltage standing wave ratio of each port, isolation degree between Power distribution ports, amplitude balance degree, phase balance degree, Power capacity and bandwidth and the like.
Wilkinson power dividers have been widely used in wireless communication and microwave systems, and since multiband systems have been valued, many wilkinson power divider structures have been proposed, which use open-circuit and short-circuit line structures, lumped element combinations or coupled line structures, respectively, and conventional dividers cannot optimize circuit connection and reduce circuit size.
Disclosure of Invention
In order to solve the above technical problem, the present invention provides a dual-band wilkinson power divider with a dual-coupling line and an open circuit line structure, wherein coupling lines having different odd-even mode characteristic impedances at both ends are inserted between an input port and an output port to reduce the circuit size, a pair of open circuit line pairs are connected to an input port to provide compensation, an isolation resistor is connected between the two coupling lines, the divider comprises a housing, a dielectric plate, an input module, an output module, three terminal resistors, and an isolation resistor, a first transmission line, a second transmission line, and a third transmission line, one end of the third transmission line is connected to the input module, the other end of the third transmission line is suspended to form an open circuit line, one end of the second transmission line is connected to the input module together with the third transmission line, the other end of the second transmission line is connected to the first transmission line, one end of the first transmission line is connected to the second transmission line, and the other end of the first transmission line is connected to a 50 ohm transmission line, the other end of the 50-ohm transmission line is connected with a terminal resistor of the output assembly, the first transmission line and the second transmission line are coupled lines, the third transmission line is an open line, the isolation resistor is connected between the first transmission line and the second transmission line, and the two coupled transmission lines respectively have odd-mode characteristic impedance and even-mode characteristic impedance.
As an improvement of the present invention, the value of the isolation resistor changes with a change in the dual-band ratio, thereby causing a change in characteristic impedance of the coupling line and the open line.
As an improvement of the present invention, the dual-band wilkinson power divider includes a dielectric plate and a microstrip line formed on the dielectric plate.
As the utility model discloses an improve, in even mould equivalent circuit, the open circuit line that links to each other with input port is higher stop band characteristic between Wilkinson power divider provides great dual-band ratio range and dual-band, in odd mould equivalent circuit, two coupling lines and isolation resistance effect have realized the isolation characteristic between the output port.
Compared with the prior art, the beneficial effects of the utility model are that: two coupling lines with different odd-even mode characteristic impedances are inserted into the input port and the output port, in the even-mode equivalent circuit, an open line connected with the input port provides a larger double-band ratio range and higher stop band characteristics between double bands for the Wilkinson power divider, and in the odd-mode equivalent circuit, the two coupling lines act with an isolation resistor, so that the isolation characteristics between the output ports are realized, and the size of the circuit is reduced.
Drawings
Fig. 1 is a schematic structural diagram of a dual-frequency wilkinson power divider.
Fig. 2 is a partial enlarged schematic diagram of a dual-frequency wilkinson power divider.
Fig. 3 is a schematic diagram of an even-mode equivalent circuit of a circuit diagram of the dual-frequency wilkinson power divider.
Fig. 4 is a circuit diagram of a double-frequency wilkinson power divider, a odd-mode equivalent circuit diagram.
Fig. 5 is a design diagram of determining characteristic impedance according to the present invention.
Wherein: 1. a termination resistor 2, a second transmission line 3, a third transmission line 4, a 50 ohm transmission line 5, an input assembly 6, an output assembly 7, a first transmission line 9 and an isolation resistor.
Detailed Description
The present invention will be further described with reference to fig. 1 to 5, but the scope of the present invention should not be limited thereto, and for convenience of description and understanding of the technical solutions of the present invention, the following description is made with reference to the drawings.
Example (b): a dual-band Wilkinson power divider with double-coupling and open-circuit line structure is characterized in that coupling lines with different odd-even mode characteristic impedances at two ends are inserted between an input port and an output port to reduce the circuit size, a pair of open-circuit line pairs are connected to the input port to provide compensation, an isolation resistor is connected between the two coupling lines, the divider comprises a shell, a dielectric plate, an input assembly 5, an output assembly 6, three terminal resistors 1 and an isolation resistor 9, a first transmission line 7, a second transmission line 2 and a third transmission line 3, one end of the third transmission line 3 is connected with the input assembly 5, the other end of the third transmission line 3 is suspended to form an open-circuit line, one end of the second transmission line 2 and the third transmission line 3 are connected to the input assembly 5 together, the other end of the second transmission line is connected with the first transmission line 7, one end of the first transmission line 7 is connected with the second transmission line 2, and the other end of the first transmission line 7 is connected with a 50 ohm transmission line 4, the other end of the 50-ohm transmission line 4 is connected with a terminal resistor 1 of the output assembly 6, the first transmission line 7 and the second transmission line 2 are coupled lines, the third transmission line 3 is an open line, the isolation resistor 9 is connected between the first transmission line 7 and the second transmission line 2, and the two coupled lines respectively have odd-mode characteristic impedance and even-mode characteristic impedance.
Further, the value of the isolation resistor 9 changes with the change of the dual-band ratio, thereby causing the change of the characteristic impedance of the coupled line and the open line.
Further, the dual-band wilkinson power divider comprises a dielectric plate and a microstrip line formed on the dielectric plate.
Further, as shown in fig. 3, in the even-mode equivalent circuit, the open line connected to the input component 5 provides a larger dual-band ratio range for the wilkinson power divider and higher stop band characteristics between the dual bands, as shown in fig. 4, in the odd-mode equivalent circuit, the two coupling lines and the isolation resistor 9 act to realize the isolation characteristics between the output ports.
In the present embodiment, two transmission lines are connected between the input port (port # 1) and the output ports (ports # 2, # 3), respectively, having odd-even mode characteristic impedances Z1e, Z1o and Z2e, Z2o, the coupling strength (unit: dB) being defined as Ki = -20log10Ci (i =1, 2), Ci being a coupling coefficient, which is defined as Ci = (Zie + Zio)/(Zie-Zio), Z3 being the characteristic impedance of the open circuit, R being an isolation resistance, Ro being a termination resistance, and considering a dual-band application, where u (u > 1) is the frequency ratio of the high-frequency pass band f2 and the low-frequency pass band 1, and θ 2 and θ 1 being the electrical lengths of these two frequencies, respectively.
Further, under the condition of K1=12 dB, all the characteristic impedances Z1e, Z2e, Z3, Z1o, Z2o, and the resistance R are determined by the frequency ratio u, and as can be seen from fig. 5, the result indicates that the proposed wilkinson power divider can be constituted by u in the range of 4.35-6 under the actual microstrip line characteristic impedance condition.
Further, according to fig. 5, according to the connection of the present invention, when the frequency ratio u = 4.5, the wilkinson power divider is proposed to calculate all characteristic impedances at two frequencies f 1= 0.5GHz and f2 = 2.25GHz as Z1e = 45.44 Ω, Z2e = 110.03 Ω, Z3 = 77.42 Ω, Z1o =27.20 Ω, Z2o = 104.95 Ω, R = 79.41 Ω, and the coupling strength K2 =32.5 dB, and according to the above data, the topology of the designed power divider is shown in fig. 1, and the theoretical results, electromagnetic simulation results, and measurement results of the proposed power divider are better matched with the simulated and measured S parameters.
Based on even mode and odd mode analysis, the dual-band Wilkinson power divider adopting the coupling line and the open line is provided, the design formula and the realization of the circuit are summarized in detail, in the experiment, the power dividers with the center frequencies of 0.5GHz and 2.25GHz are designed and manufactured, and the simulation result is better matched with the actual measurement result.
In the description of the present invention, it should be noted that the terms "upper", "one end" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation and be operated, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, and furthermore, unless otherwise explicitly stated or limited, the terms "connected" and "connected" are to be broadly interpreted, e.g., as either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made without departing from the spirit and scope of the present invention.
Claims (4)
1. A double-frequency-band Wilkinson power divider with a double-coupling line and an open-circuit line structure is characterized by comprising a shell, a dielectric plate, an input assembly (5), an output assembly (6), three terminal resistors (1), an isolation resistor (9), a first transmission line (7), a second transmission line (2) and a third transmission line (3), wherein one end of the third transmission line (3) is connected with the input assembly (5), the other end of the third transmission line is suspended to form an open-circuit line, one end of the second transmission line (2) and the third transmission line (3) are connected to the input assembly (5) together, the other end of the second transmission line (2) is connected with the first transmission line (7), one end of the first transmission line (7) is connected with the second transmission line (2), the other end of the first transmission line is connected with a 50-ohm transmission line (4), the other end of the 50-ohm transmission line (4) is connected with the terminal resistor (1) of the output assembly (6), the first transmission line (7) and the second transmission line (2) are coupled lines, the third transmission line (3) is an open line, the isolation resistor (9) is connected between the first transmission line (7) and the second transmission line (2), and the two coupled lines respectively have odd-mode characteristic impedance and even-mode characteristic impedance.
2. The dual-band Wilkinson power divider of a dual-coupled line and open line structure as claimed in claim 1, wherein the value of the isolation resistor (9) varies with the variation of the dual-band ratio, thereby causing the variation of the characteristic impedance of the coupled line and the open line.
3. The dual-band Wilkinson power divider of claim 1, wherein the dual-band Wilkinson power divider comprises a dielectric plate and a microstrip line formed on the dielectric plate.
4. The dual-band wilkinson power divider of a double-coupled line and open line structure as claimed in claim 1, wherein the open line is connected to the input block (5) in an even-mode equivalent circuit, and the two coupled lines are operated with the isolation resistor (9) in an odd-mode equivalent circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022256035.5U CN214797681U (en) | 2020-10-12 | 2020-10-12 | Dual-band Wilkinson power divider with dual-coupling line and open-circuit line structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022256035.5U CN214797681U (en) | 2020-10-12 | 2020-10-12 | Dual-band Wilkinson power divider with dual-coupling line and open-circuit line structure |
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| CN214797681U true CN214797681U (en) | 2021-11-19 |
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